Date of Completion

12-16-2015

Embargo Period

6-12-2016

Keywords

Wearable Technology; Motion Artifact, Vital Sign Monitoring

Major Advisor

Dr. Ki Chon

Associate Advisor

Dr. Kazunori Hoshino

Associate Advisor

Dr. Sabato Santaniello

Field of Study

Biomedical Engineering

Degree

Doctor of Philosophy

Open Access

Open Access

Abstract

The design and development of wearable biosensor systems for health and wellness monitoring has garnered lots of attention in the scientific community and the industry during the past decade. When it comes to health and wellness monitoring, accurate measurements, analysis and estimations would be vital. One major challenge in achieving a high performance wearable health monitoring system is motion and noise artifacts. This consideration was the basis for this dissertation. This study presents different algorithms and signal processing techniques to address motion and noise artifact detection and vital signal reconstruction from electrocardiogram/photoplethysmogram recordings. Five vital signals including ECG, PPG, Heart Rate, HRV and SpO2 are in the scope of the present dissertation. Accurate estimation of Heart Rates and Oxygen Saturation from photoplethysmogram (PPG) and Heart Rate from electrocardiogram (ECG) signals during daily physical activity is a very challenging problem. On the other hand motion and noise artifact in PPG and ECG recordings introduce challenges in early detection of heart failure diseases including Atrial Fibrillation and congestive heart failure. We address the problem of motion and noise artifact in three levels (1) “Motion and Noise Corrupted Data Removal”, and (2) “MA Corrupted Signal Usability Index Measurement” and (3) “Motion and Noise Corrupted Data Reconstruction”. Nine novel signal processing techniques (TDV, RepMA, RAFMA, IMAR, DyParaM, TifMA, OxiMA, SpaMa and SegMA) are introduced in this study to cope with the motion and noise artifact in PPG and ECG based wearable sensors. It will be shown that the proposed techniques are able to meet major aims of this study and to address the problem of motion and noise artifacts corresponding to each of the three scenarios. The results show that the algorithms presented in this study have potential for PPG or ECG based HR or SpO2 monitoring in wearable devices for fitness tracking and health monitoring during daily physical activities.

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